Type-casting mechanism



No 19, 1929. c. A, MACQMIC 4 1,736,271

TYPE CASTING MECHANISM Original Filed May 6. 1925 4 Sheets-Sheet l Nov.19, 1929.

C. A. MACOMIC TYPE CASTING MECHANISM Original Filed May 6, 1925 4Sheets-Sheet 2 .f 7 11/01 for Kwierifiacawzb Nov, w, 1929 c. A. MACOMIC1,736,271

TYPE CASTING MECHANISM Original Filed May 6, 1925 4 Sheets-Sheet 3 iiiiC'eiZe/vi Jfacame'c g; 0* m flab/Ways Nov. 19, 1929.a

c. A. MACOMIC TYPE CAST ING MECHANISM Original Filed May 6. 1925 4Sheets-Sheet 4 Mala/1 Patented Nov. 19, 1929 UNITED STATES PATENT OFFICECHESTER A. MACOMIC, or CHICAGO, ILLINOIS, ASSIGNOR To PATENT PRODUCTCOR- ronATIoN or CHICAGO, or CHICAGO, ILLINOIS, A ConronA IoN OFDELAWARE TY'rE-CAsTINe MEC ANISM Original application filed Kay 6, 1925,Serial No. 28,290. Divided and this application filed September 19, v

' 1927. Serial No. 220,611.

My invention relates to improvements in mold structure for type castingmachine and the like, and forms a divisional application based uponsubject-matter divided out of my co-pending application, Serial No.28,290, filed May 6, 1925, for type casting machine- The object of myinvention is to provide a new and improved form of mold structure whichwill be peculiarly adaptable to type casting, and wherein the mold maybe easily opened to discharge the slug and may be positively closed.- totake a second slug with a minimum of lost motion and complication. Otherobjects will appear from time to time in the specification.

. My invention is illustrated more or less diagrammatically in theaccompanying drawings, wherein- Figure 1 is a plan view of the mold andpot assembly with parts omitted;

Figures 2 and 3 are side elevations in part section, .in part brokenaway, showing the mold in closed and open position res ectively;

Figure 4 is a detail plan view of t e matrix bed beneath which the moldis supported;

Figure 5 is a skeleton view showing the op erating mechanism withmelting pot in section; and

Figure 6 is a section along the line 6-6 of Figure 1 illustrating thematrices in position for casting.

Like parts are indicated by like symbols throughout the specificationand drawings. A A is a supporting bed mounted on a rigid frame, not hereshown. Extending down the center of this bed is a flat matrix strip.supporting surface A, there being guide rai s A at either side thereofbounding the matrix strip supporting surface.

Slidably mounted upon the surface A are a plurality of matrix strips Hshown in section in Figure 6 and omitted from the remaining figures. Itwill be understood that these matrix strips are provided upon theirbottom with intaglio type impressions, and that means are provided, notforming part-of the invention claimed in the present application, forpositioning said strips to bring-the desired representations inopposition to the cast ing slot. The matrix strips form the upper.

' position of the lever.

and engage the spring collars J pinned to the bars J J sothat when thesprings expand they tend to draw the bars down and exert a squeeze onthe springs. J is a squeeze plate located beneath the s ueeze bar J, andJ 8 J 8 are springs adapted to e compressed by the downward movement ofthe bar J to hold the plate J yieldingly against the upper edges of thematrix strips. Stop pins J threaded in the bar J are in loose engagementwith the cylindrical lugs J on the upper side of the plate J, serving tolimit the downward movement of the plate with respect to the bar underthe urge. ofthe springs, and insuring that the plate will be liftedclear of the matrix strips when the bar J is raised. Opposed lugs J onthe plate and J on the bar are adapted to provide a positive contact andto limit the compression of the springs.

Pivoted on the squeeze bar J on its underside is a bell crank lever Khaving a set screw adjustment K adapted to adjust the angular K is abearin block engaging an angular yoke K overlying the mold and inslidable engagement with the rack H", on one side. K is a similar yokeengaging the rack H on the other side of the matrix bed and it isassociated with a bell from one of the bars J A spring K surrounding thepin K abuts at one end on the arm of the bell crank lever, ,at the otherend on the threaded sleeve K whereby the tension of the spring K may beadjusted.

' Thus the downward movement of the two bell crank levers engaging thetwo yokes on the inclined surface shown exerts a lateral squeeze tocompress the matrix strips laterally at the same time as they arecompressed above, thus squeezing the matrix strips together andsqueezing them against the mold.

Extending clear across the surface A and intermediate its ends is'a slotI. Located beneath the supporting bed A is a melting pot I pivoted at Ion the mainframe. It contains any suitable heating element, referablyelectrical, not here shown, where y the metal in the pot may be kept ina molten condition. I is a plunger pump adapted to discharge the moltenmetal through the spout I against the underside of a mold located at theslot I beneath the matrix strip. The cross section of the slug which iscast in this mold is indicated at I in Figure 2. The mold is formed bytwo opposed pivoted elements I I". The element I takes the form of ayoke and is pivoted for rotation on the pin 1*. The element I isinclosed between the arms of the yoke I and is eccentrically pivoted atI".

- When in the position shown in Figure 2, the

end of the spout I comes up against the underside of the mold inregister with the slug area I and locks the mold upwardly against theunderside of the assembled matrix strips.

The pivoted pins I I which carry the mold arts are pivoted in bearingsleeves I on rackets I on the mam frame. An arm I extends downwardlyandoutwardly from the mold member I and pivoted thereon by means of a looseslot I and pin I is a link I, pivon the mold element I, so as toconstrain.

both mold elements to simultaneous, but not concentric, rotation.

Assuming thatthe mold members I I" are in the casting position, as shownin Figure 2 and that the melting pot I is to be moved to the castingposition, the mechanism for efiecting this upward movement is indicatedin Figure 5. L is a cam shaft, rotated by any suitable means, and havemounted on it a number of cam elements which form no part of theinvention herein described and claimed and will therefore not bedescribed in detail. Mounted on it is the casting cam S. Forked guides SS on either side thereof straddle the cam shaft. A roller S engages thecam and is pivoted between the forked guides. S

is a push rod extending from the guides and socket S through which it ispivoted on the toggle S. S is an adjustable toggle link pivoted on oneend to the link S and at the other end on the bracket S". It will beunderstood that movement of the cam S closes the toggle and rotates thepot I into casting position, the piston I being held against verticalmovement with the pot. The link S is pivoted as at S and has associatedwith it a lever S connected by the universal joint S with the push rodsS, there being one at either side of the machine; These push rods areconnected by universal joints'S with the squeeze plungers spring heldagainst these push rods, whereby, as the mold is cast up the springs arereleased and the squeeze plate comes down.

T is the pump cam adapted to engage a roller T 'on the pump lever Twhich lever is pivoted at I and associated with this lever is a rockerlever T also pivoted at I and connected by means of a connecting link Twith the pump plunger I". The other end of this lever T overhangs thelever T and there is a spring T constrained. by an adjustingbolt Twhereby the drive from the cam through the lever T with the pump plungerI is taken through the spring T thus preventing breaking of any of theparts if it should happen that the metal in the metal pot was notmelted. T is an adjusting screw to limit the flow of the pump. '1 is abracket associated with the lever T constrained by'a spring T into theinactive position, the spring being adapted to be stretched when thelever is rotated.

It will be evident that while I have shown in 'my drawings an operativedevice still many changes might be made in the size, shape .anddisposition of parts without departing materially from the spirit of myinvention, and I wish, therefore, that my showingbe taken in a sensediagrammatic.

The use and operation of my invention are as follows:

The matrix strips are first moved to the castlng position by mechanismswhich form no part of the present invention. It will be understood thatthe upper side of the mold 1s closed by the matrix strips, with theintaglio type impressions aligned to form the against the underside ofthe matrix strips,

the opposed walls are spaced the desired thickness of the slug. Whenswung away from engagement with the matrix strips the eccentric pivotingpermits them to separate and release the slug which has been cast. Alongitudinally movable rack bar is moved back and forth to cause thisrotary movement of the mold and to bring the mold into anism. Thistoggle mechanism clamps the" spout against the mold and seats the mold.

' snugly against the underside of the bank of matrix strips. At the sametime the movement of the toggle releases an auxiliary pressure memberand permits a spring-held pressure bar to come down an-dengage the upperside of the matrix strips and support them and also by means of a levermechanism operates a clamp member which forces the matrix stripslaterally together. This is necessary because they must be normallyloose in their bed to permit the selecting and distributing movement.When the matrix strips, mold and pot are all firmly clamped together,another cam operates the pump plunger to throw a jet of molten metalupwardly into the mold. Some of this metal, enough to form the slug,solidifies in the mold, the balance drops back into the pot. Then thetoggle supporting the pot is pulled back and the pot swings downreleasing the mold. A spring finger immediately throws the mold down ashort distance below the matrix strip and then the matrix strips arepermitted to separate or spread by releasing the lateral and verticalpressure and the mold is swung down to expand its sides and permit theslug to be thrown out onto a carrier'tray carried by the mold rack bars.The necessity ofthis spring finger is obvious because it must throw themold and the slug down to enable the letters on the slug to clear thematrix strips before lateral pressure upon them is released as otherwisewhen the strips spread, they would be likely to shear off the letterscast in them and projecting from the slug.

The melting pot toggle is driven by a cam adapted to rock one of thelinks of the toggle around its fixed pivot point. When the pot is in thedown position, the inclination of the toggle link is great and a greatdeal of power'is needed to close the toggle. This power is proivded by adirect engagement with the end of a push rod leading from the cam with asocket pivoted on the toggle. The movement of the cam, however, is notsufiicient to completely close the toggle and a spring is providedbetween the socket and the push rod, the strength of which is such thatwhen the toggle is in the open position the spring is completelycompressed and there is a metal to metal contact between the end of thepush rod and the socket. But as the toggle is closed and graduallyapproaches the point at which the pot seats the mold, the mechanicaladvantage of the toggle increases and a point is finally reached wherethe load on the toggle is not sufiicient to compress the spring. Thus atthe end of the cam excursion we find that the spring has pushed thesocket away from the end of the ush rod and the final closure of the potan mold is provided by the spring and not by a rigid mechanicalconnection. This arrangement gives a smooth firm closure of pot, moldand matrix strips but avoids the danger of breaka e or distortion whichmight result from c ange in dimensions of parts as for instance 1f thesystem is frozen or filled with unmoltenmetal.

The final seating of the matrix holding elements which hold the matricesdown upon the mold'and compress them laterally is by a spring bar asabove pointed out which is allowed to go into 0 eration when aresistance member is with rawn, thus the matrix strips are held togetherand held against the mold, the metal pot is held against the mold andthe mold against the matrix strips by spring action and the metal isforced into the mold by spring action. Thus all the operations at thepoint where temperature or other changes are likely to take place andare likely to result in looseness, distortion,-

change in shape and size and the like are controlled by spring pressuressufficient to take up any inaccuracies and to insure tight fitting andmating of parts and suflicient to absorb any excessive pressure andpreventany breaklngof parts.

claim:

1. In a type casting machine, mold side elements pivoted about adjacentbut eccentric axes of rotation, said axes being positioned'upon the sameside of the mold.

2. In a type casting machine, mold side elements pivoted about adjacentbut eccentric axes of rotation, said axes being positioned upon the sameside of the mold, and means for simultaneously rotating said sideelements about their separate pivots.

3. In a type casting machine, mold side elements pivoted about adjacentbut eccentric axes of rotation, said axes being positioned upon the samesideof the mold, and means for simultaneously rotating said sideelements about their separate pivots, comprising a lever associated withone of said side elements and means for rotating it and a leverassociated with the other of said side elements and a connection betweensaid two levers.

4. In a type casting machine, mold side elements pivoted about adjacentbut eccentric axes of rotation, said axes being positioned upon the sameside of the mold, and means for simultaneously rotating said sideelements about their separate pivots, comprising a lever associated withone of said side elements and means for rotating it, a lever associatedwith the other of said side elements and a connection between said twolevers, including a projection on one of said levers and a slot in theother along which it is adapted to slide.

5. In a type casting machine, a matrix bed having: a casting slot formedtherein, abutments at either side of said slot, pivotally mounted sideelements adapted, when in the casting position, to engage saidabutments, and means for rotating said side elements,

' out of contact with said abutments, said side elements being pivotedabout separate but adjacent pivots.

6. In a type "casting machine, a matrix bed having a casting slot formedtherein, abutments at either side of said slot, pivotally mounted sideelements adapted, when in the casting position, to engage saidabutments, and means for rotating said side elements, out of contactwith said abutments, said side elements being pivoted about separate butadjacent pivots, said pivots being situated at the same side of thecasting slot.

7. In a-type casting machine having an open topped mold and a pluralityof matrix bars closing said open top, mold side elements pivoted aboutseparate axes of rotation and means for simultaneously rotating saidside elements about their separate pivots, .a casting spout memberadapted to engage said side elements and close the bottom of said mold,and means for moving it into mold closing position.

8. In a type casting machine, mold side elements pivoted about adjacentbut eccentric axes of rotation, said axes being positioned upon thesameside of the mold, acasting spout member adapted to close the bottom ofsaid mold, and means for moving it into mold closing position.

9. In a type casting machine having an open topped mold, a plurality ofeccentrically pivoted side members and a casting spout member adapted toengage said side elements and close the bottom of said mold, and meansfor moving it into mold closing position when the mold side members arein casting position.

10. In a type casting machine, a mold having opposed pivotally mountedwalls, rotatable members upon which said walls are mounted, the pivotpoints of said rotatable members being adjacent but eccentric, andunitary means for simultaneously rotating said members, said means beingadapted to bring the Walls into casting relation when in one positionand to cause the walls to separate to release the slug formed duringmold side members underlying said matrix bars, said side members beingpivoted about separate but adjacent axes of rotation and unitary meansfor rotating them about such axes, said axes being same side of themold.

13. In a type casting machine, a mold having opposed pivotally mountedwalls, such walls being adapted to rotate about axes eccentric butpositioned on the same side of the mold, the walls being in castingrela-- tion when in one position, and means for rotatmg them about theirseveral separate axes,

after the casting operation, to cause the walls positioned upon the.

to separate and to release the slug formed about the casting operation.

14. In a type casting machine, a matrix bed having a casting slot formedtherein, abutments at either side of said walls, side elements pivotallymounted to rotate about axes positioned on one side of the slot, saidelements being adapted, when in the casting position, to engage saidabutments, and means for rotating said side elements out of contact withsaid abutments.

15. In a type casting machine, a matrix bed having a casting slot formedtherein, abutments at either side of said walls, side elements'pivotallymounted to rotate about axes positioned on one side of the slot, saidelements being adapted, when in the casting position, to engage saidabutments, and

means tor rotating said side elements out of contact with saidabutments, including levers of unequal length associated with said sideelements, a flexible connection between the shorter of said levers andthe longer and means for rotating the longer of said levers.

16. In a type casting machine, a plurality of pivotally mounted moldmembers, eccentrically pivoted at one side of the mold, and

pivots, a casting spout adapted to close the bottom of said mold, andmeans for rotating it into mold closing position when the side membersare in casting position.

Signed at Chicago, county of Cook, and

State of Illinois, this th day of September,

CHESTER A. some.

